package com.wemall.pay.tenpay.util;

import java.security.MessageDigest;

public class MD5Util {
    private static final String[] hexDigits = { "0", "1", "2", "3", "4", "5",
                                  "6", "7", "8", "9", "a", "b", "c", "d", "e", "f"
                                              };

    private static String byteArrayToHexString(byte[] b){
        StringBuffer resultSb = new StringBuffer();
        for (int i = 0; i < b.length; i++){
            resultSb.append(byteToHexString(b[i]));
        }
        return resultSb.toString();
    }

    private static String byteToHexString(byte b){
        int n = b;
        if (n < 0)
            n += 256;
        int d1 = n / 16;
        int d2 = n % 16;
        return hexDigits[d1] + hexDigits[d2];
    }

    public static String MD5Encode(String origin, String charsetname){
        String resultString = null;
        try {
            resultString = new String(origin);
            MessageDigest md = MessageDigest.getInstance("MD5");
            if ((charsetname == null) || ("".equals(charsetname)))
                resultString = byteArrayToHexString(md.digest(resultString
                                                    .getBytes()));
            else
                resultString = byteArrayToHexString(md.digest(resultString
                                                    .getBytes(charsetname)));
        } catch (Exception localException){
        }
        return resultString;
    }
}




